Question

How many kilometers per hour is in 2.998 * 10^8 m/s

Answer 1

`1km=1,000m\to1m=0.001km\\\\1h=3,600s\to1s=(1)/(3,600)h\\\\2.998\cdot10^8\ (m)/(s)=2.998\cdot10^8\cdot(0.001)/((1)/(3600))\ (km)/(h)\\\\=2.998\cdot100,000,000\cdot0.001\cdot3600\ (km)/(h)\\\\=2.998\cdot100,000\cdot36\cdot100\ (km)/(h)\\\\=2.998\cdot36\cdot10^7\ (km)/(h)=107.928\cdot10^7\ (km)/(h)\\\\=\boxed{1.07928\cdot10^9\ (km)/(h)}`